Sorry for replying to myself, but:

On Thursday 31 May 2007 12:23:12 Ismail Onur Filiz wrote:
> Hi,
>
> On Wednesday 30 May 2007 14:53:28 Sundar Dorai-Raj wrote:
> > error <- function(...) {
> >    msg <- paste(..., sep = "")
> >    if(!length(msg)) msg <- ""
> >    if(require(tcltk, quiet = TRUE)) {
> >      tt <- tktoplevel()
> >      tkwm.title(tt, "Error")
> >      tkmsg <- tktext(tt, bg = "white")
> >      tkinsert(tkmsg, "end", sprintf("Error in %s: %s", "???", msg))
> >      tkconfigure(tkmsg, state = "disabled", font = "Tahoma 12",
> >                  width = 50, height = 3)
> >      tkpack(tkmsg, side = "bottom", fill = "y")
> >    }
> >    stop(msg)
> > }
>
> as.character(sys.call(-1)[[1]]) works for me.

you can furthermore do:

options(error=error)

and remove the stop(msg) call in the last line of the function. Then your 
function will become the error handler.

Best...

>
> Best...
>
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> self-contained, reproducible code.

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